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              <h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p><em>Docker 的架构图如下所示</em></p>
<p><img src="/2020/06/22/Ubuntu18-04-%E5%AE%89%E8%A3%85Docker%E5%8F%8A%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8/docker-architecture.png" srcset="/img/loading.gif" alt=" "></p>
<p><em>Docker 是一个开源的应用容器引擎，基于 Go 语言并遵从 Apache2.0 协议开源。Docker 可以让开发者打包他们的应用以及依赖包到一个轻量级、可移植的容器中，然后发布到任何流行的 Linux 机器上，也可以实现虚拟化。容器是完全使用沙箱机制，相互之间不会有任何接口( 类似 iPhone 的 app ),更重要的是容器性能开销极低。Docker 从 17.03 版本之后分为 CE( Community Edition: 社区版 )和 EE( Enterprise Edition: 企业版 )，一般来说社区版就够我们使用的啦. Docker的应用场景如下所示 :</em></p>
<ul>
<li>Web 应用的自动化打包和发布</li>
<li>自动化测试和持续集成、发布</li>
<li>在服务型环境中部署和调整数据库或其他的后台应用</li>
<li>从头编译或者扩展现有的 OpenShift 或 Cloud Foundry 平台来搭建自己的 PaaS 环境</li>
</ul>
<h2 id="Install-Docker-Engine-on-Ubuntu"><a href="#Install-Docker-Engine-on-Ubuntu" class="headerlink" title="Install Docker Engine on Ubuntu"></a>Install Docker Engine on Ubuntu</h2><p><em>在 Ubuntu 18.04 上安装 Docker CE 的流程如下所示.</em></p>
<h3 id="前提条件"><a href="#前提条件" class="headerlink" title="前提条件"></a>前提条件</h3><p><em>若要安装 Docker Engine，你需要以下版本的Ubuntu( 64位版本 ) :</em></p>
<ul>
<li>Ubuntu Focal 20.04( LTS )</li>
<li>Ubuntu Eoan 19.10</li>
<li>Ubuntu Bionic 18.04( LTS )</li>
<li>Ubuntu Xenial 16.04( LTS )</li>
</ul>
<h3 id="预载新版本"><a href="#预载新版本" class="headerlink" title="预载新版本"></a>预载新版本</h3><p><em><code>docker</code>，<code>docker.io</code>或<code>docker-engine</code>称为Ubuntu 的旧版本，如果你已安装这些，请先卸载它们 :</em></p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo apt-get remove docker docker-engine docker.io containerd runc</span></code></pre></div>


<h3 id="安装方法"><a href="#安装方法" class="headerlink" title="安装方法"></a>安装方法</h3><p><em>Docker的安装方法共有以下三种，这里选择 <code>通过仓库安装</code> 的方法，即在新主机上首次安装Docker Engine之前，需要先设置Docker仓库。之后才可以从存储库中安装及更新Docker.</em></p>
<ul>
<li>通过仓库安装</li>
<li>从安装包中安装</li>
<li>使用便捷脚本安装</li>
</ul>
<h4 id="设置存储库"><a href="#设置存储库" class="headerlink" title="设置存储库"></a>设置存储库</h4><ol>
<li><p><em>更新apt软件包索引，并安装软件包以允许apt通过HTTPS使用存储库 :</em></p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo apt-get update</span>
<span class="hljs-meta">
$</span><span class="bash"> sudo apt-get install \</span>
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common</code></pre></div>
</li>
<li><p><em>添加Docker的官方GPG密钥 :</em></p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -</span></code></pre></div>

</li>
</ol>
<p><em>( <code>9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88</code> )通过搜索指纹的这后8个字符来验证你现在是否拥有带有指纹的密钥 :</em></p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo apt-key fingerprint 0EBFCD88</span>

pub   rsa4096 2017-02-22 [SCEA]
      9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88
uid           [ unknown] Docker Release (CE deb) &lt;docker@docker.com&gt;
sub   rsa4096 2017-02-22 [S]</code></pre></div>

<ol start="3">
<li><em>使用以下命令将仓库设置为稳定的(<code>stable</code>)存储库。若要添加<code>nightly</code>或<code>test</code>的存储库，请将 nightly 或 test( 或两者 )添加到单词 stable 后面 :</em><div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo add-apt-repository \</span>
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
<span class="hljs-meta">   $</span><span class="bash">(lsb_release -cs) \</span>
   stable"</code></pre></div>

</li>
</ol>
<h4 id="安装DOCKER引擎"><a href="#安装DOCKER引擎" class="headerlink" title="安装DOCKER引擎"></a>安装DOCKER引擎</h4><ol>
<li><p><em>首先更新 apt 程序包索引，其次安装最新版本的 Docker Engine 和容器，或直接执行第二条命令来立即安装 Docker Engine :</em></p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo apt-get update</span>
<span class="hljs-meta">$</span><span class="bash"> sudo apt-get install docker-ce docker-ce-cli containerd.io</span></code></pre></div>
</li>
<li><p><em>若要安装特定版本的Docker Engine，有如下两种方式 :</em></p>
</li>
</ol>
<ul>
<li><p>方式一 : 列出存储库中可用版本，然后选择性安装 :</p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> apt-cache madison docker-ce</span>

  docker-ce | 5:18.09.1~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu  xenial/stable amd64 Packages
  docker-ce | 5:18.09.0~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu  xenial/stable amd64 Packages
  docker-ce | 18.06.1~ce~3-0~ubuntu       | https://download.docker.com/linux/ubuntu  xenial/stable amd64 Packages
  docker-ce | 18.06.0~ce~3-0~ubuntu       | https://download.docker.com/linux/ubuntu  xenial/stable amd64 Packages
  ...</code></pre></div>
</li>
<li><p>方式二 : 通过修改第二列中的版本字符串( VERSION_STRING )来安装特定版本，例如 : <code>18.09.1~3-0~ubuntu-xenial</code></p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo apt-get install docker-ce=&lt;VERSION_STRING&gt; docker-ce-cli=&lt;VERSION_STRING&gt; containerd.io</span></code></pre></div>

</li>
</ul>
<h4 id="测试"><a href="#测试" class="headerlink" title="测试"></a>测试</h4><p><em>通过运行 hello-world 映像来验证是否正确安装了Docker Engine. 此命令会下载测试图像并在容器中运行，容器运行时，它会打印参考消息( <code>hello from Docker</code> )并退出 :</em></p>
<div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo docker run hello-world</span></code></pre></div>
<p><img src="/2020/06/22/Ubuntu18-04-%E5%AE%89%E8%A3%85Docker%E5%8F%8A%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8/docker-run-hello-world.PNG" srcset="/img/loading.gif" alt=" "></p>
<h4 id="升级DOCKER引擎"><a href="#升级DOCKER引擎" class="headerlink" title="升级DOCKER引擎"></a>升级DOCKER引擎</h4><p><em>要升级Docker Engine，请先运行sudo apt-get update，然后按照以上安装说明进行操作，选择要安装的新版本</em></p>
<h3 id="卸载Docker"><a href="#卸载Docker" class="headerlink" title="卸载Docker"></a>卸载Docker</h3><ol>
<li><em>卸载Docker Engine，CLI以及Containerd软件包 :</em><div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo apt-get purge docker-ce docker-ce-cli containerd.io</span></code></pre></div></li>
<li><em>主机上的映像，容器，卷或自定义配置文件不会自动删除。若要删除所有图像，容器和卷请执行以下命令 :</em><div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">$</span><span class="bash"> sudo rm -rf /var/lib/docker</span></code></pre></div>


</li>
</ol>
<h3 id="常用命令"><a href="#常用命令" class="headerlink" title="常用命令"></a>常用命令</h3><div class="hljs"><pre><code class="hljs shell"><span class="hljs-meta">#</span><span class="bash"> 使用指南</span>
<span class="hljs-meta">$</span><span class="bash"> docker</span>
<span class="hljs-meta">#</span><span class="bash"> 查看版本号</span>
<span class="hljs-meta">$</span><span class="bash"> sudo docker version</span>
<span class="hljs-meta">#</span><span class="bash"> 查看镜像</span>
<span class="hljs-meta">$</span><span class="bash"> sudo docker images</span>
<span class="hljs-meta">#</span><span class="bash"> ...</span></code></pre></div>


<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><p><em>菜鸟教程 : <a href="https://www.runoob.com/docker/docker-tutorial.html" target="_blank" rel="noopener">Docker Tutorial</a></em></p>
<p><em>Docker Document : <a href="https://docs.docker.com/engine/install/ubuntu/" target="_blank" rel="noopener">Install Docker Engine on Ubuntu</a></em></p>

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